P.F.J. Lermusiaux, P.J. Haley, Jr., W.G. Leslie, O. Logutov, J. Xu, E.V. Heubel Massachusetts Institute of Technology Center for Ocean Engineering Mechanical Engineering Cambridge, Massachusetts This research sponsored by the Office of Naval Research.

Real-Time Analyses and Forecasts Background information Preparation and Plans Additional 2008 Pilot Study Links Accessibility

Collaborators: G. Gawarkiewicz, P. Abbot, C.-S. Chiu, K. Heaney, J. Sen, B. Cornuelle, J. Lynch, L. Mayer, B. Calder, P. Niiler

QPE Pilot Study - September 2008

Synopsis Presentation of MIT QPE 2008 Pilot Study results

Estimates of 000Z 12 September 2008 Environmental-Acoustic Conditions in the QPE Domain
Section Locations	Sound Spd. Sec. - Along shelf	Trans. Loss - Along shelf	Sound Spd. Sec. - Across shelf	Trans. Loss - Across shelf
Estimates of 000Z 12 September Environmental Conditions in and around the QPE Domain
30m Velocity	Temperature - 0m	Temperature - 50m	Salinity - 0m	Salinity - 50m

Nowcast and Forecast Products with dynamics and uncertainty descriptions	Forecast For
	6 Sep. 2008	7 Sep. 2008	8 Sep. 2008	9 Sep. 2008	10 Sep. 2008	11 Sep. 2008	12 Sep. 2008
Ocean Physics	X	X	X	X	X	X	X
Acoustics	X	X	X	X	X	X	X
Model Output	X	X	X	X	X	X	X
Skill Metrics							X
Model Output from Reanalysis Simulation

• Data collected by SeaSoar on OR1 during Pilot Study
• Data collected by OR1 during Pilot Study
• Data collected by OR2 and OR3 for Initialization
• Analysis of T and S at 10, 50 and 100m   of the above data from Sen Jan at the Institute of Hydrological and Oceanic Sciences, National Central University, Taiwan.
• Positions and T(z),S(z) in Google Earth kml files (save and run locally):   OR1     OR2     OR3

QPE 2008 Pilot Study Background information

• QPE 2008 Pilot Study Timetable
• 22-27 August - OR2/OR3 initialization cruises
• 2-5 September - OR1 deploy restrained moorings, CTD survey
• 6-13 September - OR1 coupled physical oceanography/acoustics
• Composite plot of proposed OR1,  OR2, OR3 and OMAS positions for the 2008 Pilot Study.
• SST for August/September from Taiwan Central Weather Bureau
• SST for August/September courtesy Dean Ming-Ann Lee at NTOU
• SST for August/September from NGSST Development Group, Tohuku University, Japan

Preparation and Plans for the 2008 Pilot Study

Research simulations

• Acoustic Propagation Sensitivity Simulations
During an August 2008 planning meeting at MIT, five 20 km long acoustic propagation paths were identified to explore acoustic propagation properties in the intensive acoustic area. The link below contains the results of a series of acoustic simulations along these sections, using the C-SNAP range-dependent one-way coupled modes model. These simulations are carried out within two different ocean field estimates in the region, one with a weak and the other with a stronger Cold Dome.
• Pre-exercise acoustic simulations for the intensive Pilot region.
• Ocean Dynamics

The page below presents the results of simulations of the advection of passive tracers North of Taiwan that were carried out using the Smith and Sandwell bathymetry, v9 (2007). The tracers are continually introduced at set of possible mooring locations and then advected/mixed by the dynamical ocean model equations (without wind or tidal forcing). A goal of these simulations is to estimate the influence of

• Locations of Moorings and Influence of their data near the Mien Hwa Canyon (using Smith and Sandwell bathymetry, v9)

• Bathymetric Effects

The following two links contain the main results and files for two sets of simulations that we have carried out for the Taiwan region. In each case, simulations are initialized from a regional summer climatology that we have created using the Hydrobase software and quality-controlled data also from HydroBase. The horizontal resolution is 3km and 44 terrain-following levels are used in the vertical.

• Second set of simulations (finalized in July 2008). Using the NCOR bathymetry.
• First set of simulations (finalized in June 2007). Using the Smith and Sandwell bathymetry, v9.

The above two sets of simulations have different bathymetries. The first set is based on the Smith and Sandwell Bathymetry (courtesy of Brian Calder). The second set is based on the NCOR bathymetry (National Center for Ocean Research, National Taiwan University, courtesy of Dr. San Jan). The smoothing of these bathymetries is also different, aiming to tune to amplitude of the vertical velocities for a fixed horizontal resolution of 3km. Bathymetries are presented in:

• Bathymetries and Bathymetric studies

Additional 2008 Pilot Study Links

• QPE home page - Pilot Experiment (WHOI - password-protected)
• Drifter Tracks, Sea Surface Height and Sea Surface Height Anomalies Courtesy P. Niiler, L. Centurioni and Y.Y. Kim
• Taiwan Community Ocean Model (TaiCOM)
• TaiCOM - Cruise Surveys
• Taiwan Central Weather Bureau
• NRL Monterey COAMPS Click on Kaohsiung area
• NRL-Monterey COAMPS Currents: 12-28 Aug., 5-8 Sep.
Analysis and forecast maps of ocean temperatures and currents are being generated at NRL-Monterey as part of the COAMPS product package. These maps are being collected and the analyses are displayed below for three depths. [There was an interruption in product delivery]
• Sea surface currents and temperatures.
• 50m currents and temperatures.
• 100m currents and temperatures.

Return to top of document

Important QPE references

Return to the MSEAS QPE home page

Return to the MSEAS home page